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Measurement of the forward - backward asymmetry in e+e−→bbˉe^{+} e^{-} \to b \bar{b} and the bb quark branching ratio to muons at TRISTAN using neural networks

Collaboration
Apr, 1996
18 pages
Published in:
  • Phys.Lett.B 381 (1996) 365-371
DOI:
Report number:
  • KEK-PREPRINT-96-9
Experiments:
datasets
reference search6 citations

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19971999200120032005120
Abstract: (Elsevier)
The forward-backward asymmetry in e + e − → b b at s = 57.9 GeV and the b-quark branching ratio to muons have been measured using neural networks. Unlike previous methods for measuring the b b forward-backward asymmetry where the estimated background from c -quark decays and other sources are subtracted, here events are categorized as either b b or non- b b events by neural networks based on event-by-event characteristics. The determined asymmetry is −0.429 ± 0.044 (stat) ± 0.047 (sys) and is consistent with the prediction of the standard model. The measured B B mixing parameter is 0.136 ± 0.037 (stat) ± 0.040 (sys) ± 0.002 (model) and the measured b-quark branching ratio to muons is 0.122 ± 0.006 (stat) ± 0.007 (sys).
  • electron positron: colliding beams
  • colliding beams: electron positron
  • electron positron: annihilation
  • annihilation: electron positron
  • bottom: pair production
  • pair production: bottom
  • bottom: semileptonic decay
  • semileptonic decay: bottom
  • bottom: branching ratio
  • angular distribution: asymmetry
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